I have a strong aversion to having edits applied to my work without my approval. Because of that, I don't do that to what others have written.
So what should be done with obviously wrong answers? I really don't want to edit them; that goes very much against my personal principles. I don't mind fixing an obvious typo or poor choice of wording. But fundamentally changing what a person wrote? That is just wrong to me.
Why I don't like unapproved revisions:
Long ago I had a very bad experience at work in that regard. Our team had spent over a year doing an analysis for NASA. We wrote that work up in a multi-volume white paper that used extravehicular activities (EVAs) as a central, organizing theme. Corporate HQ decided our white paper needed external review because the distribution list had some very high level people on it. Their editor didn't think that "extravehicular" was a word and changed every occurrence of "extravehicular activity" to "activity with extra vehicles" (and then he changed the acronym to AEV). He then sent the "corrected" paper straight to the printer because "except for a few minor grammatical errors, the paper was very good." He turned our report into a joke.